Insufficiently protected credentials in Schneider Electric Modicon PLCs
Priority MEDIUM 46CWE-522Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-522.
Summary
An Insufficiently Protected Credentials issue was discovered in Schneider Electric Modicon PLCs Modicon M241, all firmware versions, and Modicon M251, all firmware versions. Log-in credentials are sent over the network with Base64 encoding leaving them susceptible to sniffing. Sniffed credentials could then be used to log into the web application.
Why it matters now
EPSS 0.0225 83rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Schneider Electric Modicon PLCs | Schneider Electric Modicon PLCs | — | No fix listed | CNA |
- Schneider Electric Modicon PLCs Vendor— Affected Schneider Electric Modicon PLCs Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:schneider-electric:modicon_m241_firmware:*:*:*:*:*:*:*:* | up to 4.0.3.20 | Vulnerable | Schneider Electric |
| cpe:2.3:h:schneider-electric:modicon_m241:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Schneider Electric |
| cpe:2.3:o:schneider-electric:modicon_m251_firmware:*:*:*:*:*:*:*:* | up to 4.0.3.20 | Vulnerable | Schneider Electric |
| cpe:2.3:h:schneider-electric:modicon_m251:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Schneider Electric |
- cpe:2.3:o:schneider-electric:modicon_m241_firmware:*:*:*:*:*:*:*:* Versions up to 4.0.3.20 Vulnerable ·Schneider Electric
- cpe:2.3:h:schneider-electric:modicon_m241:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Schneider Electric
- cpe:2.3:o:schneider-electric:modicon_m251_firmware:*:*:*:*:*:*:*:* Versions up to 4.0.3.20 Vulnerable ·Schneider Electric
- cpe:2.3:h:schneider-electric:modicon_m251:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Schneider Electric
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2017-6028
- 2026-10-03 Alias added: GHSA-55h6-p6m7-f4h7
References
More Schneider Electric Modicon M241 Firmware vulnerabilities
- TI-2017-03936 A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon… CVSS 3.1CRITICAL 9.1
- TI-2019-04853 Missing authentication in Modicon and PacDrive Controller, All versions of: Modicon M100… CVSS 3.1HIGH 8.2
- TI-2020-06010 Insufficient verification of data authenticity in EcoStruxure Machine Expert SoMachine… CVSS 3.1CRITICAL 9.8
- TI-2020-06011 Cleartext transmission of sensitive information in EcoStruxure Machine Expert SoMachine… CVSS 3.1HIGH 7.5
- TI-2017-03940 Schneider Electric Modicon PLCs Predictable Value Range from Previous Values CVSS 3.1MEDIUM 6.5
- TI-2025-12703 CWE-404 Improper Resource Shutdown or Release vulnerability exists that could cause… CVSS 4.0MEDIUM 6.9
Sources
- CVE-2017-6028 · CVE Program
- CVE-2017-6028 · NVD
- FIRST EPSS
- GHSA-55h6-p6m7-f4h7 · GitHub Advisory Database · CC BY 4.0
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